MP
Mary Pierce — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Pottawattamie-County, Iowa
Our Model Tree links this Mary Pierce across the 1930 and 1940 US Censuses in Pottawattamie-County, Iowa (XGBoost, ~Confirmed) — first a daughter (b.~1916), then head of a 9-person household.
Age 24
b. ~1916
Female
Daughter
Born: Colorado
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Pottawattamie-County, Iowa |
| Surname | Pierce |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Colorado |
| 1935 Residence (City) | Washington Twp |
| 1935 Residence (County) | Pottawattamie |
| Additional Details | |
| Occupation | School Teacher |
| Industry | Public School |
| Class of Worker | GW |
| Hours Worked | 60 |
| Income (1939) | 720 |
| Highest Grade | H 4 |
| 1935 Residence | Same House |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
| Occupation | Teacher |
| Township / Ward | Washington Twp |
| Est. Birth Year | ~1916 |
Household Members
Census records only state relationship to the household head.
Pairwise kinship is derived (~90–95% accurate), not recorded.
Step/blended families and boarders can break it.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mildred Pierce | Daughter | — | 13 | ~1927 |
| Helen Pierce | Daughter | — | 22 | ~1918 |
| Edna Pierce | Daughter | — | 27 | ~1913 |
| Mary Pierce | Daughter | — | 24 | ~1916 |
| Arthur Pierce | Head | — | 57 | ~1883 |
| Fred Pierce | Son | — | 20 | ~1920 |
| Robert Pierce | Son | — | 11 | ~1929 |
| Ralph Pierce | Son | — | 17 | ~1923 |
| Sara Pierce | Spouse | — | 55 | ~1885 |
Census Appearances
1930
Pottawattamie, Iowa
Daughter, age 13
Pottawattamie, Iowa · implied b. ~1917 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Pierce |
| Given Name | Mary L |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Colorado |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Kansas |
| Can Read/Write | Yes |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
1940
Pottawattamie-County, Iowa
Daughter, age 24
Pottawattamie-County, Iowa · implied b. ~1916 — 9 household members
| Surname | Pierce |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Colorado |
| 1935 Residence (City) | Washington Twp |
| 1935 Residence (County) | Pottawattamie |
| Occupation | School Teacher |
| Industry | Public School |
| Class of Worker | GW |
| Hours Worked | 60 |
| Income (1939) | 720 |
| Highest Grade | H 4 |
| 1935 Residence | Same House |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
Model Tree
An inferred pedigree reconstructed from census links — up to 4 generations within the 1900–1950 window. Closer generations are built from household co-residence; deeper ones are bridged by following a relative to their own childhood census. Confidence compounds and weakens with each generation.
Our Model Tree links Mary Pierce across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Pierce
Daughter · 1940 · age 24 · b. ~1916 · Iowa
★ You are viewing this record
Sibling
Helen Pierce
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ralph Pierce
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mildred Pierce
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Fred Pierce
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Pierce
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edna Pierce
Sibling · 1940 · age 27
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Pottawattamie-County, Iowa
Open full size
1940 US Federal Census — Pottawattamie-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01199-00957)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Kenneth Bentley | 28 | Son | Farmer | Iowa |
| 42 | Leona Bentley | 20 | Daughter | — | Iowa |
| 43 | Sherwood Bentley | 17 | Son | — | Iowa |
| 44 | Lucille Blanchard | 21 | Hired girl | Maid | S. Dakota |
| 45 | Pearl Frede | 40 | Head | Farm Manager | Iowa |
| 46 | Lois Frede | 14 | Daughter | — | Iowa |
| 47 | Lowell Frede | 11 | Son | — | Iowa |
| 48 | Everett Gustin | 30 | Hired man | Laborer | Iowa |
| 49 | William Gustin | 64 | Hired man | Laborer | Iowa |
| 50 | Ray Guttan | 28 | Hired man | Laborer | Iowa |
| 51 | Clarence Evans | 53 | Head | Farmer | Illinois |
| 52 | Elsie Evans | 51 | Wife | — | Iowa |
| 53 | Orval Evans | 30 | Son | Laborer | Iowa |
| 54 | John Eyberg | 63 | Head | Farmer | Germany |
| 55 | Anna Eyberg | 62 | Wife | — | Germany |
| 56 | Herman H. Eyberg | 33 | Son | — | Iowa |
| 57 | Adolph Eyberg | 31 | Son | Laborer | Iowa |
| 58 | Melvin Eyberg | 21 | Son | — | Iowa |
| 59 | Harry Eyberg | 43 | Head | Farmer | Iowa |
| 60 | Mary O. Eyberg | 33 | Wife | Nursing | Iowa |
| 61 | William Graybill | 87 | Lodger | — | Iowa |
| 62 | Arthur Pierce | 57 | Head | Farmer | Iowa |
| 63 | Sara Pierce | 55 | Wife | — | Kansas |
| 64 | Edna Pierce | 27 | Daughter | School Teacher | Colorado |
| 65 | Mary Pierce THIS PERSON | 24 | Daughter | School Teacher | Colorado |
| 66 | Helen Pierce | 22 | Daughter | School Teacher | Iowa |
| 67 | Fred Pierce | 20 | Son | Farmer | Iowa |
| 68 | Ralph Pierce | 17 | Son | Laborer | Iowa |
| 69 | Mildred Pierce | 13 | Daughter | — | Iowa |
| 70 | Robert Pierce | 11 | Son | — | Iowa |
| 71 | Archie Neighbors | 33 | Head | Laborer | Missouri |
| 72 | Myrtle Neighbors | 30 | Wife | — | Missouri |
| 73 | Archie Jr. Neighbors | 9 | Son | — | Iowa |
| 74 | Freddie Neighbors | 1 | Son | — | Iowa |
| 75 | William Cutshall | 54 | Head | Farmer | Pennsylvania |
| 76 | Ethel Cutshall | 55 | Wife | — | Iowa |
| 77 | Floyd Hager | 42 | Head | Laborer | Kansas |
| 78 | Kenneth Hager | 15 | Son | — | Iowa |
| 79 | Edith Hager | 12 | Daughter | — | Iowa |
| 80 | Doris Hager | 10 | Daughter | — | Iowa |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1940 United States Federal Census (NARA). Our Model Tree links this person across census decades using XGBoost-based record linkage, with per-link confidence scores. Household corroboration strengthens the signal when co-residents appear on the same census pages in multiple years.
Source: National Archives and Records Administration (NARA)